Anti-HBs titre categories (mIU/ml) Diabetics Non-diabetics MCP
No. % No. %
After first booster n=45   n=45   0.028*
<10 7 15.6  0 0.0
10-100 2 4.4  4 8.9
>100 36 80.0 41  91.1
After second booster n= 9   n= 4   0.109!
10-100 44.4  0 0.0
>100 55.6  4 100.0
After third booster n= 4       NA
>100 4 100.0  0 0.0
Z(P) -2.428 (0.015*) £ -2.00(0.046*)  
Table 4: Anti-HBs titre categories of HBV immune response among the studied students after booster doses measured in mIU/ml. Z: Wilcoxon test of two related groups, MCP: P value based on Mont Carlo exact probability, ! P value based on Fisher exact probability P£: P value based on Friedman test of several related samples, 4° : Three from the 7 unprotected after the 1st boosting and one from the 2 having anti-HBs level of 10-100 mIU/ml after the 1st boosting, 5˜ : Four from the 7 unprotected after the 1st boosting and one from the 2 having anti-HBs level of 10-100 mIU/ml after the 1st boosting.